lenovo/s230u: Add Thinkpad Twist (S230U)

Created using autoport plus some manual work and copying from G505S to
account for the non-H8 EC.

This model uses the same ENE KB9012 EC as the G505S.

Tested:
- Mainboard variant with 8GB Elpida DDR3
- SeaBIOS payload
- Booting into Linux 4.9.6 with Debian/unstable installed on the
  internal HDD/SDD slot
- Native raminit
- Both native VGA init and option rom VGA init
- Basic TPM functionality (auto-detection and RNG)
- Battery status readout
- Basic ACPI functions (power button event; power-off; reboot)
- thinkpad-acpi hotkey functions
- thinkpad-acpi LED control (red thinkpad LED)
- Suspend to RAM and resume works
- Mini displayport output works

Known issues:
- Patches needed for EC battery support
  https://review.coreboot.org/#/c/18348/
  https://review.coreboot.org/#/c/18349/
- No thermal zone since temperature sensing is not H8-compatible
  and needs to be reverse engineered.

Not tested:
- msata/wwan (probably works)

Signed-off-by: Tobias Diedrich <ranma+coreboot@tdiedrich.de>
Change-Id: I52bc4515277e5c18afbb14a80a9ac788049f485c
Reviewed-on: https://review.coreboot.org/18351
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Rudolph <siro@das-labor.org>

1 files changed, 140 insertions, 0 deletions

diff --git a/src/mainboard/lenovo/s230u/smihandler.c b/src/mainboard/lenovo/s230u/smihandler.c
new file mode 100644
index 000000000000..755f176e9177
--- /dev/null
+++ b/src/mainboard/lenovo/s230u/smihandler.c
@@ -0,0 +1,140 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2008-2009 coresystems GmbH
+ * Copyright (C) 2014 Vladimir Serbinenko
+ * Copyright (C) 2017 Tobias Diedrich <ranma+coreboot@tdiedrich.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; version 2 of
+ * the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include "ec.h"
+
+#include <arch/io.h>
+#include <console/console.h>
+#include <cpu/x86/smm.h>
+#include <delay.h>
+#include <ec/acpi/ec.h>
+#include <ec/compal/ene932/ec.h>
+#include <southbridge/intel/bd82x6x/pch.h>
+
+#define GPE_PALMDET1	2
+#define GPE_PALMDET2	4
+#define GPE_EC_SCI	7
+#define GPE_EC_SMI	8
+/* FIXME: check this */
+#define GPE_EC_WAKE	13
+
+static void mainboard_smm_init(void)
+{
+	printk(BIOS_DEBUG, "initializing SMI\n");
+}
+
+int mainboard_io_trap_handler(int smif)
+{
+	static int smm_initialized;
+
+	if (!smm_initialized) {
+		mainboard_smm_init();
+		smm_initialized = 1;
+	}
+
+	return 0;
+}
+
+enum sleep_states {
+	S0 = 0,
+	S1 = 1,
+	S3 = 3,
+	S4 = 4,
+	S5 = 5,
+};
+
+enum ec_smi_event {
+	EC_SMI_EVENT_IDLE = 0x80,
+	EC_SMI_BATTERY_LOW = 0xb3,
+};
+
+/* Tell EC to operate in APM mode. Events generate SMIs instead of SCIs. */
+static void ec_enter_apm_mode(void)
+{
+	ec_kbc_write_cmd(0x59);
+	ec_kbc_write_ib(0xE9);
+}
+/* Tell EC to operate in ACPI mode, thus generating SCIs on events, not SMIs. */
+static void ec_enter_acpi_mode(void)
+{
+	ec_kbc_write_cmd(0x59);
+	ec_kbc_write_ib(0xE8);
+}
+
+static uint8_t ec_get_smi_event(void)
+{
+	ec_kbc_write_cmd(0x56);
+	return ec_kbc_read_ob();
+}
+
+static void ec_process_smi(uint8_t src)
+{
+	/*
+	 * Reading the SMI source satisfies the EC in terms of responding to
+	 * the event, regardless of whether we take an action or not.
+	 */
+
+	printk(BIOS_DEBUG, "Unhandled EC_SMI event 0x%x\n", src);
+}
+
+static void handle_ec_smi(void)
+{
+	uint8_t src;
+
+	while ((src = ec_get_smi_event()) != EC_SMI_EVENT_IDLE)
+		ec_process_smi(src);
+}
+
+void mainboard_smi_gpi(u32 gpi_sts)
+{
+	if (gpi_sts & (1 << GPE_EC_SMI))
+		handle_ec_smi();
+}
+
+int mainboard_smi_apmc(u8 data)
+{
+	printk(BIOS_INFO, "mainboard_smi_apmc(%02x)\n", data);
+
+	switch (data) {
+	case APM_CNT_ACPI_ENABLE:
+		printk(BIOS_DEBUG, "Enable ACPI mode\n");
+		ec_enter_acpi_mode();
+		gpi_route_interrupt(GPE_EC_SCI, GPI_IS_SCI);
+		gpi_route_interrupt(GPE_PALMDET1, GPI_IS_SCI);
+		gpi_route_interrupt(GPE_PALMDET2, GPI_IS_SCI);
+		break;
+	case APM_CNT_ACPI_DISABLE:
+		printk(BIOS_DEBUG, "Disable ACPI mode\n");
+		ec_enter_apm_mode();
+		gpi_route_interrupt(GPE_EC_SCI, GPI_IS_SMI);
+		break;
+	default:
+		printk(BIOS_DEBUG, "Unhandled ACPI command: 0x%x\n", data);
+	}
+	return 0;
+}
+
+void mainboard_smi_sleep(u8 slp_typ)
+{
+	if (slp_typ == S3) {
+		u8 ec_wake = ec_read(0x32);
+		/* If EC wake events are enabled, enable wake on EC WAKE GPE. */
+		if (ec_wake & 0x14)
+			gpi_route_interrupt(GPE_EC_WAKE, GPI_IS_SCI);
+	}
+}